Add dark mode

assets/js/app.js

@@ -22,8 +22,12 @@ import {Socket} from "phoenix"
 import {LiveSocket} from "phoenix_live_view"
 import topbar from "../vendor/topbar"
 
+import {DarkModeHook} from './dark-mode'
 let csrfToken = document.querySelector("meta[name='csrf-token']").getAttribute("content")
-let liveSocket = new LiveSocket("/live", Socket, {params: {_csrf_token: csrfToken}})
+let liveSocket = new LiveSocket("/live", Socket, {
+  params: {_csrf_token: csrfToken},
+  hooks: {dark_mode_widget: DarkModeHook},
+})
 
 // Show progress bar on live navigation and form submits
 topbar.config({barColors: {0: "#29d"}, shadowColor: "rgba(0, 0, 0, .3)"})

assets/js/dark-mode.js

@@ -0,0 +1,36 @@
+let DarkModeHook = {
+
+  mounted() {
+    this.button = this.el.querySelector("button")
+    this.button.addEventListener("click", this.show_selector.bind(this))
+    this.selector = this.el.querySelector("ul")
+    var lis = this.el.querySelectorAll("li")
+    lis[0].addEventListener("click", this.switch_to_day_mode.bind(this))
+    lis[1].addEventListener("click", this.switch_to_night_mode.bind(this))
+    lis[2].addEventListener("click", this.switch_to_system_mode.bind(this))
+  },
+  show_selector(){
+    this.selector.classList.remove("hidden")
+  },
+  switch_to_day_mode() {
+    document.documentElement.classList.remove('dark')
+    localStorage.theme = 'light'
+    this.selector.classList.add("hidden")
+  },
+  switch_to_night_mode() {
+    document.documentElement.classList.add('dark')
+    localStorage.theme = 'dark'
+    this.selector.classList.add("hidden")
+  },
+  switch_to_system_mode() {
+    if (window.matchMedia('(prefers-color-scheme: dark)').matches) {
+      document.documentElement.classList.add('dark')
+    } else {
+      document.documentElement.classList.remove('dark')
+    }
+    localStorage.removeItem('theme')
+    this.selector.classList.add("hidden")
+  },
+}
+
+export {DarkModeHook}

assets/tailwind.config.js

@@ -4,6 +4,7 @@
 const plugin = require("tailwindcss/plugin")
 
 module.exports = {
+  darkMode: 'class',
   content: [
     "./js/**/*.js",
     "../lib/*_web.ex",
@@ -23,4 +24,4 @@ module.exports = {
     plugin(({addVariant}) => addVariant("phx-submit-loading", [".phx-submit-loading&", ".phx-submit-loading &"])),
     plugin(({addVariant}) => addVariant("phx-change-loading", [".phx-change-loading&", ".phx-change-loading &"]))
   ]
-}
+}

lib/outlook_web.ex

@@ -90,6 +90,7 @@ defmodule OutlookWeb do
       import OutlookWeb.HtmlDocComponent
       import OutlookWeb.TunitEditorComponent
       import OutlookWeb.PublicComponents
+      import OutlookWeb.DarkModeComponent
       import OutlookWeb.Gettext
 
       # Shortcut for generating JS commands

lib/outlook_web/components/dark_mode_component.ex

@@ -0,0 +1,38 @@
+defmodule OutlookWeb.DarkModeComponent do
+  @moduledoc """
+    Provides components for showing and listing artikel and autoren.
+  """
+  use Phoenix.Component
+  import Phoenix.HTML
+
+  # alias Phoenix.LiveView.JS
+
+  def dark_mode_widget(assigns) do
+    ~H"""
+    <div id="dark-mode-widget" class="relative flex flex-row-reverse p-4" phx-hook="dark_mode_widget">
+      <button type="button" id="headlessui-listbox-button-4" aria-haspopup="true" aria-expanded="true" data-headlessui-state="open" >
+        <span class="dark:hidden">
+          <Heroicons.sun class="w-5 h-5 stroke-slate-400 dark:stroke-slate-500" />
+        </span>
+        <span class="hidden dark:inline">
+          <Heroicons.moon class="w-5 h-5 stroke-slate-400 dark:stroke-slate-500" />
+        </span>
+      </button>
+      <ul class="hidden absolute z-50 top right-2 bg-white rounded-lg ring-1 ring-slate-900/10 shadow-lg overflow-hidden w-36 py-1 text-sm text-slate-700 font-semibold dark:bg-slate-800 dark:ring-0 dark:highlight-white/5 dark:text-slate-300 mt-8" aria-labelledby="headlessui-listbox-label-3" aria-orientation="vertical" id="headlessui-listbox-options-5" role="listbox" tabindex="0" data-headlessui-state="open">
+        <li class="py-1 px-2 flex items-center cursor-pointer" id="selector-option-1" role="option" tabindex="-1" aria-selected="false" data-headlessui-state="">
+          <Heroicons.sun  class="w-5 h-5 mr-2 stroke-slate-400 dark:stroke-slate-500" />
+          Light
+        </li>
+        <li class="py-1 px-2 flex items-center cursor-pointer" id="selector-option-2" role="option" tabindex="-1" aria-selected="false" data-headlessui-state="">
+          <Heroicons.moon class="w-5 h-5 mr-2 stroke-slate-400 dark:stroke-slate-500" />
+          Dark
+        </li>
+        <li class="py-1 px-2 flex items-center cursor-pointer text-slate-700 dark:text-slate-300" id="selector-option-3" role="option" tabindex="-1" aria-selected="true" data-headlessui-state="selected">
+          <Heroicons.computer_desktop class="w-5 h-5 mr-2 stroke-slate-400 dark:stroke-slate-500" />
+          System
+        </li>
+      </ul>
+    </div>
+    """
+  end
+end

lib/outlook_web/components/layouts/app.html.heex

@@ -34,6 +34,7 @@
       </a>
     </div>
   </div>
+  <.dark_mode_widget />
 </header>
 <main class="px-4 py-20 sm:px-6 lg:px-8">
   <div class="mx-auto max-w-4xl">

lib/outlook_web/components/layouts/proot.html.heex

@@ -10,8 +10,16 @@
     <link phx-track-static rel="stylesheet" href={~p"/assets/app.css"} />
     <script defer phx-track-static type="text/javascript" src={~p"/assets/app.js"}>
     </script>
+    <script type="text/javascript">
+      // On page load or when changing themes, best to add inline in `head` to avoid FOUC
+      if (localStorage.theme === 'dark' || (!('theme' in localStorage) && window.matchMedia('(prefers-color-scheme: dark)').matches)) {
+        document.documentElement.classList.add('dark')
+      } else {
+        document.documentElement.classList.remove('dark')
+      }
+    </script>
   </head>
-  <body class="bg-white antialiased max-h-screen">
+  <body class="bg-white dark:bg-stone-900 dark:text-stone-100 antialiased max-h-screen">
     <%= @inner_content %>
   </body>
 </html>

lib/outlook_web/components/layouts/public.html.heex

@@ -3,6 +3,7 @@
     <img class="w-full" src="/images/elbefoto-lg.jpg"
       src-set="elbefoto-xxl.jpg 4496w, /images/elbefoto-lg.jpg 2248w, /images/elbefoto-md.jpg 1199w, /images/elbefoto-sm.jpg 991w, /images/elbefoto-xs.jpg 767w">
   </a>
+  <.dark_mode_widget />
 </header>
 <main class="px-4 py-20 sm:px-6 lg:px-8">
   <div class="mx-auto max-w-4xl">

lib/outlook_web/components/layouts/root.html.heex

@@ -10,6 +10,14 @@
     <link phx-track-static rel="stylesheet" href={~p"/assets/app.css"} />
     <script defer phx-track-static type="text/javascript" src={~p"/assets/app.js"}>
     </script>
+    <script type="text/javascript">
+      // On page load or when changing themes, best to add inline in `head` to avoid FOUC
+      if (localStorage.theme === 'dark' || (!('theme' in localStorage) && window.matchMedia('(prefers-color-scheme: dark)').matches)) {
+        document.documentElement.classList.add('dark')
+      } else {
+        document.documentElement.classList.remove('dark')
+      }
+    </script>
   </head>
   <body class="bg-white antialiased max-h-screen">
     <ul>

lib/outlook_web/controllers/artikel_html/show.html.heex

@@ -1,5 +1,5 @@
 <header class="mb-20">
-  <h1 class="text-lg font-semibold leading-8 text-zinc-800"><%= @artikel.title %></h1>
+  <h1 class="text-lg font-semibold leading-8 text-stone-800 dark:text-stone-200"><%= @artikel.title %></h1>
   <p class="my-2"><.link href={"/autoren/#{@artikel.article.author.id}"}><%= @artikel.article.author.name %></.link>
      &nbsp;&nbsp;&nbsp; — &nbsp;&nbsp;&nbsp;<%= Calendar.strftime(@artikel.article.date, "%d.%m.%Y") %></p>
   <div>Original